What are the measurement range, accuracy, and response time of Rika's Dissolved Oxygen (DO) Sensor?

Rika Sensor’s RK500-04 (Fluorescence Method) Dissolved Oxygen sensor represents the cutting edge of optical sensing technology. It is designed for clients seeking the weather sensors best suited for maintenance-free, long-term aquatic monitoring.

• Standard Model: Features a range of 0 – 20 mg/L with an accuracy of ±0.2 mg/L, ideal for freshwater aquaculture, river monitoring, and municipal wastewater treatment.
• Wide-Range Model: Customizable up to 0 – 50 mg/L to meet the requirements of high-concentration aeration or specialized industrial processes.

• Zero Flow Dependency: Unlike traditional polarographic sensors, the fluorescence method does not consume oxygen during measurement. This allows for accurate readings even in completely stagnant water.
• Low Maintenance Overhead: This environmental sensor requires no electrolyte refilling and is immune to interference from hydrogen sulfide. The robust fluorescence cap offers a long service life and is incredibly easy to replace.

• Response Time (T90): The sensor achieves 90% of its final reading in less than 40 seconds.
• Digital Connectivity: Equipped with a standard RS485 (Modbus-RTU) interface, it integrates effortlessly into any weather station or cloud-based water quality network, ensuring stable data transmission over long distances.

In addition, the sensor is made of 316L all stainless steel with an IP68 protection grade, supporting pipeline or submersible installation. It has a power supply range of 7-30VDC and can output RS485 and 4-20mA signals simultaneously. It is equipped with a 5-meter cable by default and supports customization, with an annual drift of ＜0.2mg/L. It can operate stably under a working temperature of -5℃-+60℃ and a working pressure of 0.8Mpa, adapting to various complex water quality monitoring environments in outdoor and industrial sites. It is a highly suitable choice for online DO monitoring in various industries.